Computer/internet problem. Links transfer me to unwanted websites!?

For example. Sometimes, when I search something on google and then I click the title. It transfers me to a random website, not the website indicated by the title or the url under the description of the website. Also when I was on dictionary.reference.com and I clicked thesaurus it transferred me to a href="http://results.ask.com/" rel="nofollow"http://results.ask.com//a instead of the thesaurus section. It does transfer me to the correct url if I directly type in the url to the url bar. What is wrong with my computer and how do I fix it?